Thread cutting mechanism for weft replenishing looms



A 21, 1934., A, A, GORDON 1,970,743

THREAD CUTTING MECHANISM FOR WEFT REPLENI 'SHING LOOMS Filed April 13, 1933 3 Sheets$heet l Aug. 21, 1934. A. A. GORDON L fi THREAD CUTTING MECHANISM FOR WEFT REPLENISHING LOOMS I Filed April 13, 1933 3 Sheets-Sheet 2 Aug. 21, 1934. A. A. GORDON 1,970,743

THREAD CUTTING MECHANISM FOR WEFT REPLENISHING' LOOMS Filed April 15 1935 a Sheets-Sheet s 4 v jzyzzzzax' ///////v// ///i lg fly/Z 110 A further object of the invention-is to provide above identified.

Patented Aug. 21, 1934 :35

THREAD CUTTING -MECHANISM FOR- WEF REPLENISHING LOOMS Y T I Albert A. Gordon, Worcester, Mass.,,assignor to Crompton' & Knowles Loom Works, Worcester,

Mass, a corporation of Massachusetts Application April 13, 1933, Serial No. 665,920

1 Claim. (01. 139-261 This invention relates to weft replenishing 1) which is connected through a link 28 to the looms and particularly -to loom s having multimechanism which controls the shifting of the color stationary weft carrier magazines. drop boxes.

It is the general object of my invention topro- Usual operating mechanism (not shown) is provide improved thread cutting mechanism for such vided forgiving the rock shaft 26 a rocking move- 80.

looms, normally heldin inoperative position but ment and for connecting the same'to depress a preferably released by the operating mechanism selected bobbin holder 14. For a more complete for the magazine on indication of substantial weft description of the magazine and its operating exhaustion. mechanism, reference is made to my prior patent a thread cutter which will be opened after release The transfer member is given an operative and during rearward movement thereof, and rearward movement by an arm 30 (Fig. 1)

which will be closed to grip and cut the thread mounted on-a fixed pivot 31 and provided with a by n m n by'the lay as the lay moves for stud 32 extending into the L-shaped slot 19. A

15 ward after such release of the threadcutter. second arm 33 is fast with the arm 30 and y v n i n fur her relates to arrangements is provided with a cam roll 34 engaged by a double and combinations of parts which will be hereincam 35 on the usual cam shaft 36 of the loom,

after described and more particularly pointed out which makes one revolution to each two picks of in the appended claim. the lay.

20 A preferred form of the invention is shown in Under normal conditions, the stud 32 oscillates the drawings, in which freely in the slot 19 but on indication of weft ex- Fig. 1 is a side elevation of parts of a loom em- 'haustion the plate 18 is raised, so that the stud 32 bodying my improvements, with the shuttle boxes is caught in the downwardly extending portion of shown in section; the slot 19 and draws the transfer member 15 25 Fig. 2 is an enlarged side elevation of certain rearward to transfer abobbin from the depressed parts shown in Fig. 1, with the shuttle boxes shown bobbin holder to the indicated shuttle. in section; All of these parts are of well-known construc- Fig. 3 is an enlarged front view, looking in the tion and in themselves form no part of my present direction of the arrow 3 in Fig. 2; invention, which relates particularly to improved 30' Fig. 4 is a detail sectional plan view, taken along thread cutting mechanism and control devices the line 4-4 in Fig. 1, and therefor.

Fig. 5 is a plan view of the thread cutter, partly My improved thread cutter comprises a memin section and looking in the direction of the ber 40 (Figs. 2 and 5) fixed at the upper end of a arrow 5 in Fig. 2. lever 41 pivoted on a stud 42 which in turn is .35. Referring to the drawings, I have shown pormounted on a bracket 43 secured to the loom side tions of a loom comprising a loom side 10, lay 11, 10. A coil spring 44 (Fig. 3) is mounted on the drop boxes 12 and a multi-color weft magazine stud 42 and acts to move the thread cutter rear- M. The magazine is preferably of the type shown ward whenever the same is released. An adin detail in my prior Patent #1,766,895, issued justable stop 45 limits such rearward movement.

40 June 24, 1930 and comprises an upright frame 13 My thread cutter also comprises a movable cutin which bobbin holders or compartments 14 ter blade 50 (Fig. 5) and a clamping or pressure (Fig. 3) are vertically slidable, said holders being plate 51, the latter plate being held from angular selectively depressed to present a desired color or movement relative to the member 40 but being kind of bobbin in the path of a transfer member pressed yieldingly toward the blade 50 and mem- 15 (Fig. 1). ber 40 by a spring washer 52 secured by a clamp- The transfer member is supported on a pivoted ing bolt 53. rod 16 connected by a link 17 to a plate 18 having The cutter blade 50 is pivoted on the bolt 53 a substantially L-shaped slot 19 therein and also and has an upwardly extending offset projection provided with a segmental surface 20 engaged by 54 (Fig. 2) and a depending projection 55. A

50 the rear end of an arm 21. The arm 21 is mountlatch 60 (Figs. 2 and 4) is pivoted at 61 on a stand ed on a rock shaft 22 having a second arm 23 62 and is held from clockwise movement (as connected by a link 24 to an arm 25 on a rock viewed in Fig. 2) but is free to swing in the opposhaft 26 having both a rocking and a sliding site direction. movement. The sliding movement of the shaft When the thread cutter is released and moves 55 26 is under the control of the bell crank 2'? (Fig. rearward, the projection 54 is engaged by the no (Fig. 3) positioned for engagement by the offset lower end '71 of a locking lever 72,' mounted on-'a.

fixed pivot 73 and having its upper endportion 74 positioned for engagement by an arm .75 extending downward from ftherdck shaft26. A

spring '76 normally holds the lockingljever 'lz inj the full line position shown in Fig. 3.

When the thread cutter is forced forward byengagement by the lay, the beveled lug '70 dis-, places the depending projection '71 of the lever {I2 and passes beyond the same, but the lever 72 thereafter snaps back to initial position and prevents return or rearward movement of the thread cutter until-the'lever 72 isgiven a releasing movementby the rocking of the rock shaft 26, which rocking movement simultaneously .depreses a selected bobbin holder 14 andpresents a fresh weft carrier in the path of the transfer member 15.; ,At the same time the plate 18 (Fig. 1) is raised to connect the transfer-member 1 5: with its operating cam 35. t 3

1 I have thus provided means bywhich anon mally inoperative thread cutter is released for rearward movement to operative position simul: taneously. withthe presentation of a fresh weft carrier in transfer position, and I have further provided means bywhich the means for ,withuse 1,970,743 latch (i0 and the cutter blade is rocked to the drawing the locking lever to release the thread cutter and the means for presenting the weft carrier in position for transfer are simultaneously operated by a single actuating element.

I thus insure that the timed relation between the presentation of the .weft carrier in, transfer position and the release of the thread; cutter shall be positively predetermined and not liable to variation. I While my improved thread cutting mechanism and its operating connections are capable of general applicationto weft replenishing looms, it

' possesses special advantages when used in pickand-pick looms in which two or more shifting shuttle boxes are provided at the magazine side of, the loom. With my improved mechanism, the

thread cutter is released very promptly upon indication'of weft exhaustion and moves rearward to engage and cut the thread before any opportunity occurs for displacement of the weft end or for entangling thereof with the weft ends connected to other shuttles. v Having thus describedmy invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claim, but what I claim is:-- l In a loom, a weftcarrier magazine having a plurality of bobbin holders selectively movable downward to present a bobbin in transfer posi tion, a-rock shaft effective to depress a selected bobbin holder on indication of substantial weft exhaustion, a thread cutter normally held in in-, operativepositiom-and means actuated ,by said rocl; shaft to release said thread cutter-substanr tially simultaneously with the depression of ,said selected bobbinholder thereby. v g

. ALBERTA. GORDON. 

